Quick opening container

ABSTRACT

A cylindrical dough can including a body wall formed from two rectangular sheets of approximately equal size bonded together with two pairs of corresponding edges out of alignment so as to form two extensions. The body wall is made into a tube with the extensions bonded together in overlapping relationship along a permanent longitudinally extending seal. Within the body wall is a thin fluid impervious sealing liner, e.g., a foil having a mechanically weak but fluid tight inner seal isolated from the longitudinal seal. A provision such as a tear string is used for severing the outer sheet along a line spaced circumferentially from the overlap area. When pulled, the string penetrates the complete thickness of the outer sheet thereby providing a flap which serves as a pull tab. When the pull tab is lifted, tension is transmitted from the outer extension to the inner extension through the permanent seal thereby separating adjacent cut edges of the inner sheet from one another. The inner seal is then opened.

United States Patent Leezer et al.

3,669,346 1 June 13, 19 72 QUICK OPENING CONTAINER [72] Inventors: JamesR. Leezer, Jeffersonville, lnd.; Francis R. Reid, Minneapolis, Minn;Charles H. Turpin, Louisville, Ky.; Jack J. Rejsa, Minneapolis, Minn.

[73] Assignee: The Pillsbury Company, Minneapolis,

Minn.

[22] Filed: July3, 1969 [21] Appl.No.: 838,926

[52] U.S.Cl. ..229/51BP,229/4.5

[51] lnt.Cl ..B65d3/26 [58] FieldofSeai-ch ..229/5l,4.5;99/172 [56]References Cited UNITED STATES PATENTS 2,795,366 6/1957 Magill..229/51BP,

3,122,305 2/1964 Young 3,506,183 4/1970 Turpin etal ..229/51BP PrimaryExaminer-Donald F. Norton Attorney-Ronald E. Lund, James V. Harmon andM. Paul Hendrickson [57] ABSTRACT A cylindrical dough can including abody wall formed from two rectangular sheets of approximately equal sizebonded together with two pairs of corresponding edges out of alignmentso as to form two extensions. The body wall is made into a tube with theextensions bonded together in overlapping relationship along a permanentlongitudinally extending seal. Within the body wall is a thin fluidimpervious sealing liner, e.g., a foil having a mechanically weak butfluid tight inner seal isolated from the longitudinal seal. A provisionsuch as a tear string is used for severing the outer sheet along a linespaced circumferentially from the overlap area. When pulled, the stringpenetrates the complete thickness of the outer sheet thereby providing aflap which serves as a pull tab. When the pull tab is lifted, tension istransmitted from the outer extension to the inner extension through thepermanent seal thereby separating adjacent cut edges of the inner sheetfrom one another. The inner seal is then opened.

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QUICK OPENING CONTAINER The present invention relates to packagingproducts and more particularly to a can which is particularly useful forstoring and shipping unbaked refrigerated dough under pressure. Thecontainer of this invention is, however, also useful for packagingmaterials which exert no pressure.

A dough can is described in U.S. Pat. No. 3,214,078 which includes alongitudinally extending lap joint with an adjacent tear tab. Althoughthis container is satisfactory for many applications, the leakage ofmoisture, oil or gas into the space between the overlapped walls issometimes a serious problem and the extra thickness of material at thelap joint presents a raw edge which is unsightly. Moreover, the doublethickness of the container wall in the overlap area interferes withreliably crimping the metal can ends onto the tubular can body.

Other containers evaluated in the development of the present inventionopened with a loud pop or had thin unsupported portions of the liner orlabel extending beyond the side edges of the body wall when the bodymaterial is rolled up upon itself in coil form before being made into atube. Such extensions can be easily damaged.

It is, therefore, an object of this invention to provide a simplyconstructed tubular container which includes an effective provision foreliminating the leakage of material into the open space between theoverlapped layers of the body wall.

Another object of the invention is the provision of an improved quickopening can for the packaging of refrigerated dough with alongitudinally extending lap joint and a provision which allows theoverlapped and sealed area to be reduced in size thereby lessening thetendency for the container to be out of round.

A further object of the invention is the provision of an improvedcontainer suited for storing fresh dough and having an opening tabincluding a longitudinally extending free marginal edge which can bepulled circumferentially to open the container and in which the lengthof the opening tab can be varied substantially without changing the sizeof the overlap area between the inner and outer plies of the container.

A further object of the invention is the provision of an improvedcontainer of the type described in which the longitudinally extendingedges of the liner and label do not project beyond the adjacent edges ofthe container body wall.

A further object of the invention is the provision of a can for storingmaterial under pressure with a provision that enables the can to beopened without a loud popping noise.

A further object of the invention is the provision of an improvedcontainer of the type described in which the body wall of the containeris essentially constant in thickness thereby allowing sheet metal discs(can ends) to be reliably crimped to the cut ends of the body wall.

Another object of the invention is the provision of an improved pressureretaining container including a tubular body wall having alongitudinally extending opening tab and a provision that enables thebody wall of the container to be withdrawn from the crimped seam of themetal can end when the tab is pulled.

These and other more detailed and specific objects will become apparentfrom the following description of the invention and drawings wherein:

FIG. 1 is a perspective view of a can embodying the invention.

FIG. 2 is a side elevational view of the container of FIG. 1 withthe'opening tab partially drawn back.

FIG. 3 is a semi-diagramatic transverse sectional view taken through thestock material used for forming the tubular wall of the container.

FIG. 4 is a transverse sectional view of the container during the laststages of manufacture.

FIG. 5 is a view similar to FIG. 4 after the assembly of the body wallhas been completed.

FIG. 6 is a partial longitudinal sectional view of the end of thecontainer.

FIG. 7 is a partial transverse sectional view showing the first stage inopening the container.

FIG. 8 is a view similar to FIG.'7 showing a subsequent stage ofopening, and

FIG. 9 is a view similar to FIG; 8 showing a later stage in the openingprocedure.

In the accomplishment of the above objectives, the invention thencomprises the features hereinafter fully described and particularlypointed out in the claims, the following description setting forth indetail certain illustrative embodiments of the invention, these beingindicative, however, of but a few of the various ways in which theprinciples of the invention may be employed.

Briefly, the present invention provides a cylindrical can in which thebody wall is formed from at least two sheets each having four edges. Thesheets are preferably rectangular but any parallelogram is suitable. Thetwo sheets making up the body wall need not have exactly the same shape.The sheets are bonded together with two pairs of their correspondingedges out of alignment. In this way, two generally longitudinallyoriented extensions are provided. This composite sheet is formed into atube with extensions positioned in overlapping relationship and adheredto one another to provide a longitudinally extending bond defining innerand outer butt joints. A provision is made for tearing the outer layerof the body wall longitudinally along a tear line positioned at anypoint circumferentially of the overlap area within and preferably within45 of the overlap area. When the outer layer is torn along this line, apull tab is formed by the longitudinally extending free edge adjacentthe tear. When the pull tab is lifted and pulled back toward the overlaparea, the force exerted from the outer extension is transmitted to theinner extension through the permanent bond thereby separating theadjacent edges of the inner butt joint from one another and preferablywithdrawing the ends of the body wall from their crimped position in thecan ends.

The container preferably includes a fluid impervious liner formed fromthin sheet material lying adjacent to the inner surface of the body wallof the container. The liner is folded outwardly over edges of the innersheet that define the inner butt joint and lie adjacent to its outersurface near the longitudinally extending edge thereof. This flap of theliner is bonded to the overlying material of the pull tab so that whenthe tab is used to open the container, the flap will swing free of theunderlying inner sheet material to provide an expansion space for thedough.

' The invention will now be described in detail with reference to thefigures.

As seen in the figures, the container indicated generally by the numeral10 comprises a can formed from a tubular body wall 12 and sealed on eachend by two identical circular metal end caps 11 and 13. The body wall 12is formed from flexible sheet material 14 (FIG. 3) composed of alaminate consisting of two relatively thick interior sheets 16 and 18.These sheets may be about 0.014 inches thick and composed of paperboard.Sheets 16 and 18 are suitably bonded to one another by an adhesive 20which can be applied either in selected areas or, if desired, over theentire contacting surface. As seen in FIG. 3, the sheets 16 and 18 arepositioned relative to one another such that their side edges(longitudinally extending edges when formed into a cylinder) arepositioned out of alignment so as to provide an internal extension 22and an external extension 24. The two remaining edges of the body wall12, i.e., those that fit into the edges of the can ends 11 and 13 arepositioned in alignment with one another. Accordingly, it is only thetwo longitudinally extending edges that are positioned out of alignmentwith one another to provide the circumferentially projecting innerextension 22 and the circumferentially projecting extension 24.

A liner 26 which is formed from any of a variety of fluid imperviousmaterials such as a laminate composed of aluminum foil bonded to Kraftpaper is glued preferably over substantially the entire exposed surfaceof the inner sheet 18. The liner 26 functions to prevent the penetrationof water and grease from the inside of the package into the paperboardlayer 18.

A label 28 is preferably bonded to the exterior surface of the sheet 16.If used, the label 28 can be formed from the same material as the liner26 and is normally printed with the name of the product and directionsfor its preparation. When no label is used, sheet 16 can be printed.

As best seen in FIGS. 3 and 4, the edges of neither the liner nor labelextend beyond the longitudinally disposed edges of the sheets 16 and 18.In the case of the label, its longitudinally disposed edges terminate inalignment with the corresponding edges of the outer sheet 16. The edgeof the liner 26 adjacent to the extension 22 is folded outwardly andthence back upon the outer edge of the extension 22 and is securelybonded to it by adhesive at 32 thereby forming a longitudinallyextending permanently secured hem 30.

The opposite end of the liner 26 is folded outwardly in a loose mannerand back upon the outer surface of the body sheet 18 to provide a freehem 34 which is not bonded or otherwise fastened to the adjacent surface36 of the inner sheet 18.

Positioned between the sheets 16 and 18, adjacent to the outer terminalextension 24 is a lead-in sheet 40 formed from a fluid imperviousmaterial which may be the same as the liner and label. It is securelybonded to sheet 16 by adhesive 42. As shown in FIG. 3, the free edge ofthe sheet 40 extends slightly beyond the free edge of the inner bodysheet 18. The opposite edge of the sheet 40 extends to a longitudinallyextending tear means such as tape 44 which is bonded to the sheet 16 bymeans of adhesive 46. It will be noted that the tear tape 44 is spacedcircumferentially a distance from the overlap of the extensions 22 and24, Le, it is outside of the overlap area. Spacing between the overlaparea and the tear tape 44 can be as great as desired but should not beso short that the fingers of the person opening the can come in contactwith the dough as it is expelled from the can at the time the can isopened.

As clearly shown in FIGS. 3, 4 and 5, only the edge of the free hem 34is bonded by a liquid tight seal 50 (e.g., a hot melt adhesive sealformed by applying molten heat-sealing adhesive to the hem 34) to theoverlying lead-in sheet 40. Only the edge of the free hem 34 is adheredto the lead-in sheet for reasons to be described below.

As shown in FIGS. 1 and 2, a C-shaped cut 52 is provided at one end ofthe tear tape 44 throughthe label 28 and outer sheet 16 of the core todefine a pull tab 54 at the leading edge of the tear tape 44.

The end caps or closures 11 and 13 each consist of a thin metal discremovably crimped by means of seams 56 and 58 to the upper and lowercircular edges 15 and 17 respectively of the body wall 12. After thebottom closure 11 has been applied, the biscuits are placed in thecontainer and the top closure 13 is applied and crimped, in other words,seamed, at 58 in a conventional manner to the upper circular edge 15 ofthe container 10.

As shown in FIGS. 4 and 5 which illustrate successive stages of formingthe body wall 12 into a tube, the outer extension 24 is bonded inoverlapping relationship to the inner extension 22 by means of apermanent bond 60 of any suitable adhesive adapted to keep the partspermanently bonded together. By permanent is meant a bond which will notopen when the container is opened. A permanent bond is also made at 62between the fixed hem 30 and the overlying portion of the lead-in sheet40. A relatively narrow longitudinally extending peelable bond is madebetween the edge of the free hem 34 and the overlying lead-in sheet 40.The bond 50 functions to raise the hem 34 when the container is opened.In the last stages of opening the bond 50 peels apart. Thus the bonds 50and, 62 provide a reliable grease and moisture barrier to prevent theescape of material from the container even though the contents are underconsiderable pressure while the bond 60 provides the requisite strengthfor preventing separation of the overlapping extensions 22 and 24.

Referring primarily to FIG. 3, a preferred method of fabricating thepackage will now be described.

The stock used to makethe container is assembled in accordance with apreferred manufacturing procedure by bonding the pull tab 44 and thelead-in strip 40 to sheet 16. At the same time, the label 28 is bondedto the outer surface of sheet 16.

The liner 26 is glued to the undersurface of sheet 18 and both theleftand right-hand edges thereof are folded upwardly and centrally overthe corresponding edges of sheet 18. The fixed him 30 is then bonded tothe outer surface of the extension 22 with the adhesive 32.

The resulting sheets are next glued together by adhesive designated 20.It will be noted that adhesive 20 does not ex tend at the right to thetear tape 44 (FIG. 3). Accordingly, the portion of sheet 16 and 18 tothe right-hand side thereof as seen in FIG. 3 are not bonded togetherexcept by the narrow bond 50 between the liner 26 and the overlyinglead-in tab 40. Excellent results have been obtained when the bond 50 isformed by heat sealing. In this event, the liner or the lead-in tab arecoated with a heat sealing varnish or resin. The bond 50 covers just theedge of the hem 34 as mentioned above. The completed contour body 12consists of a sheet which is shown in transverse cross section in FIG.3. It is normally rolled up upon itself to form a large coil or storageroll before being cut and formed into a tube.

The body wall 12 can be formed into a tube in any suitable known manneras described, for example, in U.S. Pat. Nos. 3,213,890 and 3,139,012.The last stage of the tubing operation is shown in FIG. 4. At the stageshown in FIG. 4, the extension 24 is drawn toward and placed inoverlapping relationship with extension 22. The longitudinally extendingband of adhesive 60 securely bonds the adjacent flaps together andprovides a permanent connection between them. When the edges of the tubeare brought together, an external longitudinal butt joint and internallongitudinal butt joint 82 are formed.

The bond 62 is preferably formed at the same time as bond 60. The bond62 is preferably formed by heat sealing (in which event either theinward surface of the lead-in tab 40 or the adjacent surface of theliner 26 is covered with a heat sealing varnish or other thermoplasticresin) or by extruding a hot melt adhesive into the seam.

After the tube has been made and cut transversely at 15 and 17, thecircular metal end or bottom closure 13 is applied by removably crimpingits edges onto the adjacent end 17 of the container body 12. Byremovably is meant that the edges of the body wall are capable of beingremoved (i.e., withdrawn) without being torn apart when the container isopened and the tab 86 is pulled.

After the bottom closure 13 has been applied, the contents of thepackage, e.g., pieces of biscuit dough 84 (FIG. 2), are inserted. Thedough normally contains a leavening material such as an acid and a basein sufficient quantity to maintain the dough within the container underpressure during. its normal storage period.

The lid 1 l is placed on the top of the container and its edgesremovably crimped to the edge 15 of the container body 12.

The manner in which the package is opened will now be described withparticular reference to FIGS. 1, 2, 7, 8 and 9.

The tear tape 44 is first pulled from left to right as seen in FIGS. 1,2, 7, 8 and 9 by grasping the extension 54. Pulling the tape 44 producesa longitudinally extending opening tab 86 which the user then graspswith his fingers and pulls upwardly as seen in FIG. 2. At the tab 86 ispulled open (toward the right as seen in FIG. 5), the opening force istransmitted to the sheet 18 by means of the permanent bond 60 and tosome extent by the bond 62.

It should be noted that as the tab 86 is lifted, the unattached portionof the free hem 34 pivots outwardly as a free swinging panel since it isnot adhered to the underlying body sheet 18. As this is done, thepressurized dough is expelled through the opening between the butt joint82 into an expansion area 88. In this way, the pressure of the dough isrelieved without causing the container to pop when opened.

Continued movement of the pull tab 86 toward the right as seen in FIGS.7, 8 and 9 will cause the liquid tight seal 50 to be broken. Furthermovement of the tab 86 will slide the cut ends and 17 of the fiber bodywall 12 from their tightly engaged position within the seams 56 and 58.Because the thickness of the body wall is approximately the same at allpoints around the circumference of the container, the force required towithdraw the body wall from the seams 56 and 58 is constant.Accordingly, the tube 12 can be easily capped and readily opened.

The invention has a number of important advantages. The container can bereadily opened without the occurrence of a loud, objectionable pop, andit is relatively easy to make a wide opening in the container since thecut ends 15 and 17 slide out of the seams 56 and 58. This allows thosebiscuits adjacent the metal discs 1 1 and 13 to be readily removed.

It will also be seen that the liquid tight seals 50 and 62 prevent theleakage of moisture, gas and oil in the interior of the containerthrough the butt joint 82 into the area between the sheets of materialfrom which the container wall is formed. Moreover, no unsightly raw edgeof the material exists at the lap joint.

A further advantage of the invention is the elimination of laterallyextending unsupported portions of the liner or label which, if present,can be easily damaged when the raw material for the container body isstored in roll form.

A further advantage of the invention is the reduction in the width ofthe overlap area. This is desirable because it tends to make thecontainer more exactly circular. 7

It is apparent that many modifications and variations of this inventionas hereinbefore set forth may be made without departing from the spiritand scope thereof. The specific embodiments described are given by wayof example only and the invention is limited only by the terms of theappended claims.

We claim:

1. A pressure-retaining tubular container comprising a substantiallycylindrical core formed from at least a pair of sheets of material eachhaving four edges, said sheets being bonded together with two pairs oftheir corresponding edges out of alignment to provide a pair oflongitudinally oriented extensions, said core being formed into a tubewith the extensions positioned in overlapping relationship therebydefining outer and inner butt joints extending between the ends of thecylindrical core, a permanent bond between the overlapping extensions,an end closure member affixed to at least one end of the tube, a meansfor tearing the outer sheet of the core along a line extendinglongitudinally of the container outside of the overlapped area closer tothe inner butt joint than the outer butt joint, the outermost extensiondefining a pull tab from the material of the outer sheet between thetear means and the overlap area which when lifted and pulled toward theoverlap area transmits forces from the pull tab through the permanentbond to the inner sheet so as to separate the adjacent edges of theinner butt joint from one another and thereby open the container, apiece of sheet material extends circumferentially from the inner buttjoint over the outer surface of the inner sheet, at least the freemarginal edge thereof is removably adhered to the overlying surface ofthe outer sheet and the opposite edge thereof is connected to theadjacent longitudinally extending edge of the underlying sheet, wherebya free swinging panel is defined to provide a space to receive theexpanding dough as the package is opened.

2. The container of claim 1 wherein, said piece of sheet material is aliner adhered to substantially the entire inner surface of the core, oneedge of the liner being folded outwardly over a longitudinally extendingedge of the inner sheet and bonded to the outer surface thereof to forma fixed hem and the opposite edge of the liner is folded outwardly overthe outer surface of the liner and its free marginal edge portion isbonded to the overlying surface of the outer sheet.

3. A container according to claim 2 wherein the bond between said freeedge of the liner and the outer sheet is formed with a heat sealingadhesive.

4. The container according to claim 2 wherein the bond between the fixedhem and an overlying portion of said core is formed from a heat sealingadhesive.

5. The container according to claim 1 wherein a lead-in sheet formedfrom a fluid impervious sheet material is bonded to the inner surface ofthe outer sheet in the area between the overlap of the extensions andthe tear means and a liner formed from sheet material is bonded to theinner surface of the inner sheet and is folded outwardly over theadjacent edges of the inner butt joint and is bonded to the overlyingportion of the lead-in sheet to prevent the leakage of fluids from thecontainer.

6. The container according to claim I wherein the overlap area extendsparallel to the longitudinal axis of the cylinder.

7. The container according to claim 1 wherein the tear means comprises atear tape bonded to the inside surface of the outer sheet.

8. The container according to claim 1 wherein a pair of circular endclosure members are removably crimped to the ends of the tube wherebythe pulling of the pull tab outwardly will cause the edges that arecrimped into the end closure members to be withdrawn from the closuremembers as the container is opened to permit the container to be opened.

9. A can comprising a tubular body wall, at least one end closure memberaffixed to one end of the body wall to provide a bottom for thecontainer, said body wall being formed from at least a pair of sheetseach having four edges and being bonded together over at least a portionof their contacting surfaces and having overlapping extensions definingnonaligned outer and inner longitudinally extending butt joints, a tearmeans for serving at least the outermost of the sheets to define alifting tab, a lead-in barrier material bonded to the inner surface ofthe sheet that is severed when the tear means is utilized, a linerformed from fluid impervious material bonded to the inner surface of thecontainer and having a fixed hem composed of a section folded outwardlythrough the inner butt joint and back upon the underlying sheet andbonded to the underlying sheet material of the body wall, and a bondbetween the outer surface of the fixed hem and the overlying lead-inmaterial, pulling a force exerted upon the lifting tab toward the innerbutt joint will be transmitted through the bond between the fixed hemand the lead-in sheet to the underlying portion of the container bodythereby separating the adjacent parts of the inner butt joint from oneanother, said bond between the lead-in sheet and the fixed hempreventing the leakage of fluid from the container.

10. The container according to claim 9, wherein the opposite end of theliner is also folded outwardly through the inner butt joint area andback upon itself to define a second hem, at least a portion of the outersurface of the second hem being also bonded to the overlying lead-insheet to provide a substantially fluid-tight seal for preventing theloss of materials from the container.

11. The container according to claim 9 wherein a pair of circular endclosure members are removably crimped to the ends of the tube wherebythe pulling of the lifting tab outwardly will cause the edges that arecrimped into the end closure members to be withdrawn from the closuremembers as the container is opened to permit the container to be openedin the area of the end closure members.

12. A pressure-retaining container for materials under pressurecomprising a tubular body wall, at least one end closure member affixedto the end of the tube to form a bottom for the container and said bodywall having a line of separation extending from one end of the containerto the other for opening the container, said body wall including in atleast part of its circumference a pair of overlapping sheets, afree-swinging panel connected between the overlapping sheets and beingsecured to the innermost of the two sheets at a point adjacent to theline of separation and extending circumferentially therefrom betweensaid sheets and having its end furthest removed from the line ofseparation secured to the outer of the two sheets to provide afree-swinging panel, lifting of the outermost of the overlapping sheetsand pulling outwardly thereupon will cause the panel to swing away fromthe innermost sheet to provide an expansion space into which thecompressed material is free to expand as the tab is pulled to preventthe container from popping when opened.

1. A pressure-retaining tubular container comprising a substantiallycylindrical core formed from at least a pair of sheets of material eachhaving four edges, said sheets being bonded together with two pairs oftheir corresponding edges out of alignment to provide a pair oflongitudinally oriented extensions, said core being formed into a tubewith the extensions positioned in overlapping relationship therebydefining outer and inner butt joints extending between the ends of thecylindrical core, a permanent bond between the overlapping extensions,an end closure member affixed to at least one end of the tube, a meansfor tearing the outer sheet of the core along a line extendinglongitudinally of the container outside of the overlapped area closer tothe inner butt joint than the outer butt joint, the outermost extensiondefining a pull tab from the material of the outer sheet between thetear means and the overlap area which when lifted and pulled toward theoverlap area transmits forces from the pull tab through the permanentbond to the inner sheet so as to separate the adjacent edges of theinner butt joint from one another and thereby open the container, apiece of sheet material extends circumferentially from the inner buttjoint over the outer surface of the inner sheet, at least the freemarginal edge thereof is removably adhered to the overlying surface ofthe outer sheet and the opposite edge thereof is connected to theadjacent longitudinally extending edge of the underlying sheet, wherebya free swinging panel is defined to provide a space to receive theexpanding dough as the package is opened.
 2. The container of claim 1wherein, said piece of sheet material is a liner adhered tosubstantially the entire inner surface of the core, one edge of theliner being folded outwardly over a longitudinally extending edge of theinner sheet and bonded to the outer surface thereof to form a fixed hemand the opposite edge of the liner is folded outwardly over the outersurface of the liner and its free marginal edge portion is bonded to theoverlying surface of the outer sheet.
 3. A container according to claim2 wherein the bond between said free edge of the liner and the outersheet is formed with a heat sealing adhesive.
 4. The container accordingto claim 2 wherein the bond between the fixed hem and an overlyingportion of said core is formed from a heat sealing adhesive.
 5. Thecontainer according to claim 1 wherein a lead-in sheet formed from afluid impervious sheet material is bonded to the inner surface of theouter sheet in the area between the overlap of the extensions and thetear means and a liner formed from sheet material is bonded to the innersurface of the inner sheet and is folded outwardly over the adjacentedges of the inner butt joint and is bonded to the overlying portion ofthe lead-in sheet to prevent the leakage of fluids from the container.6. The container according to claim 1 wherein the overlap area extendsparallel to the longitudinal axis of the cylinder.
 7. The containeraccording to claim 1 wherein the tear means comprises a tear tape bondedto the inside surface of the outer sheet.
 8. The container according toclaim 1 wherein a pair of circular end closure members are removablycrimped to the ends of the tube whereby the pulling of the pull taboutwardly will cause the edges that are crimped into the end closuremembers to be withdrawn from the closure members as the container isopened to permit the container to be opened.
 9. A can comprising atubular body wall, at least one end closure member affixed to one end ofthe body wall to provide a bottom for the container, said body wallbeing formed from at least a pair of sheets each having four edges andbeing bonded together over at least a portion of their contactingsurfaces and having overlapping extensions defining nonaligned outer andinner longitudinally extending butt joints, a tear means for serving atleast the outermost of the sheets to define a lifting tab, a lead-inbarrier material bonded to the inner surface of the sheet that issevered when the tear means is utilized, a liner formed from fluidimpervious material bonded to the inner surface of the container andhaving a fixed hem composed of a section folded outwardly through theinner butt joint and back upon the underlying sheet and bonded to theunderlying sheet material of the body wall, and a bond between the outersurface of the fixed hem and the overlying lead-in material, pulling aforce exerted upon the lifting tab toward the inner butt joint will betransmitted through the bond between the fixed hem and the lead-in sheetto the underlying portion of the container body thereby separating theadjacent parts of the inner butt joint from one another, said bondbetween the lead-in sheet and the fixed hem preventing the leakage offluid from the container.
 10. The container according to claim 9,wherein the opposite end of the liner is also folded outwardly throughthe inner butt joint area and back upon itself to define a second hem,at least a portion of the outer surface of the second hem being alsobonded to the overlying lead-in sheet to provide a substantiallyfluid-tight seal for preventing the loss of materials from thecontainer.
 11. The container according to claim 9 wherein a pair ofcircular end closure members are removably crimped to the ends of thetube whereby the pulling of the lifting tab outwardly will cause theedges that are crimped into the end closure members to be withdrawn fromthe closure members as the container is opened to permit the containerto be opened in the area of the end closure members.
 12. Apressure-retaining container for materials under pressure comprising atubular body wall, at least one end closure member affixed to the end ofthe tube to form a bottom for the container and said body wall having aline of separation extending from one end of the container to the otherfor opening the container, said body wall including in at least part ofits circumference a pair of overlapping sheets, a free-swinging panelconnected between the overlapping sheets and being secured to theinnermost of the two sheets at a point adjacent to the line ofseparation and extending circumferentially therefrom between said sheetsand having its end furthest removed from the line of separation securedto the outer of the two sheets to provide a free-swinging panel, liftingof the outermost of the overlapping sheets and pulling outwardlythereupon will cause the panel to swing away from the innermost sheet toprovide an expansion space into which the compressed material is free toexpand as the tab is pulled to prevent the container from popping whenopened.